Process for recovering nitrous vapors in the form of aqueous nitric acid



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o irsnf sense s rmmrrn s'oeus'rn GUYE, or enemy's, swrrznnrnnn, iissrenon re runner-r1 rnericsrs, seamen monies-rs, or rnnrsrn een PEQCESS FOR RECQVEIMNG- NI'EROUS VAEOR-S H3 THE FOEIEE "AQUEO'UQ it"iifitit? AGED.

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vented certain new useful Improvementsin 'iProcesses for Recovering Nitrous Vapors in the Form, of Aqueous 'Nitric Acid, of

ess for recoverin whichlthe following 1s a specification.

he present invention relates to a procnitrous vapors in the form of aqueous nitric acid,

The nitrous vapors which are diluted in a great excess of nitrogen and" oxygen, for instance ata rate of 1% NO -by volume, are

not'easil absorbed by water. That is the reason w y the industrial devices such'as' for [instance washing towers, which are employed in" such e case, do hardly alloys to easily recover a nitric acid of a concentration superior to20to per cent HNO y It has been found that. by interposing in I the eseous current fibrous substances such as gees-wool or cotton impregnatedwith wa'ter,.it'is easy tot'obtain a concentrated nitric acid containing up to 5G; and 55 per portion of the apparatus containing the fibrous materials, a small Water stream is charged with nitric ecid. The process may'bean intermittent one centHNO Upon this observance the following lproe ess is based. 4 I The mixture of nitrogen and oxygen con taining small doses of nitrous'vapors isidi rected through devices such a's towers, me.

tion rooms and the like containing fibrous materials impregnated with ater; While the gases pass'through those materials the water and then the acid formed may be separated by draining, by centriiugaliorce or'hy e pressing. The process may also he a continuous one by introducing into theupper Ap lication filed Gctober s, new. seri'el nan 115,106,.

whilst at the bottom part the solution gr-i nitric acid is collected. I l v As fibrous materisl ell'hodies having this structure and which resist more or less nitric acid of medium concentration may 'beemployed; these bodies are for instance: glassv'vool, asbestos fibres; cotton may be em-' ployed for nitric acid the concentration of which does not exceed per cent HWO the glass wool and asbestos may also be admixed with the cotton.

These bodies may be employed alone or two or three of them may be mined together for example, cotton and glass-Wool or one ton, glass-Wood and asbestos. "I claimi- J 1. A'proces's for recovering nitrous vapors which are-diluted with on excess of nitrogen and oxygen, consisting in causing these. gasses to react with Water which 1irinregiieutes fibrous materai resistant to nitric acid.

2. A process for recovering nitrous vapors which are dilutedwith anex cess of nitrogen and oxygen, consisting in causing these gases to react with water which impregneizes cotton. A proee'ss for recovering nitrons vng iors whichare-idiluted with an excess of nitrogen and oxygen, consisting in causing these gases to reset 7 with Water which im iregnates e mistnreot' giass-wooi and cotton. I A-processfor-recovering nitrous vapors which are diluted with an excess of nitrogen and oxygemconsisting in causing thee to react with, water which inipregnates e mixture oi? glass-wool, asbestos fibres cotton.

in'testimon whereer l; aiiix my signaturein presenceo .tyvo w tnesses. I

- PHILZPEE 

